- I recommend having a look at the KNIME cheatsheets: they are 1-pager visual summaries of all the "nodes that matter" within a specific topic. Check them out at https://www.knime.com/cheat-sheets.
- Regular expressions can extend your pattern matching dramatically. They are very useful when you need to clean data and check for adherence to complex formatting rules. Get a crash course on RegEx from https://regexone.com/ or use https://regexr.com/ to test your expressions directly on the web.
- KNIME channel on YouTube is full of short videos to explore nodes and techniques. Have a look at it: https://www.youtube.com/user/KNIMETV.